1680219799 has 4 divisors (see below), whose sum is σ = 1768652440. Its totient is φ = 1591787160.

The previous prime is 1680219791. The next prime is 1680219829. The reversal of 1680219799 is 9979120861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9979120861 = 4049 ⋅2464589.

It is a cyclic number.

It is not a de Polignac number, because 1680219799 - 2³ = 1680219791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680219791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44216292 + ... + 44216329.

It is an arithmetic number, because the mean of its divisors is an integer number (442163110).

Almost surely, 2^1680219799 is an apocalyptic number.

1680219799 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1680219799 is a deficient number, since it is larger than the sum of its proper divisors (88432641).

1680219799 is an equidigital number, since it uses as much as digits as its factorization.

1680219799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88432640.

The product of its (nonzero) digits is 489888, while the sum is 52.

The square root of 1680219799 is about 40990.4842493962. The cubic root of 1680219799 is about 1188.8362322641.

The spelling of 1680219799 in words is "one billion, six hundred eighty million, two hundred nineteen thousand, seven hundred ninety-nine".